Items tagged with NOISE Files

Nordtest Methods provided in 2002; NT ACOU 114 “Acoustics: Measurement of occupational noise exposure of workers – Survey method” and NT ACOU 115 “Acoustics: Measurement of occupational noise exposure of workers – Engineering method” were tested by making round robin tests in Nordic countries. The methods contain survey and engineering measurements that are based on short-term measurements and splitting up of the working day in work operations with similar noise levels.

The interest in the effect of background noise on our health and capacity for work has increased. One of the disturbing factors in office spaces, schools etc. is the drum sound, especially when the flooring consists of thin wood parquet or laminate. Drum sound is the noise that appears when an object, e.g. a foot, hits the flooring in the same room as the receiving ear.

A method for the determination of source parameters for estimation of road vehicle noise has been developed. The main parts of the method have been tested with measurements and this verifies that the method can be used in practice.

The aim of the present work is to prepare a Nordtest-method in two parts, namely a simple method for use to safety deputies, persons in industrial or occupational hygiene or in occupational health care etc., and a more advanced method requiring a great deal of competence in acoustics in order to achieve better accuracy in measurement results, if needed.

This guideline describes a preliminary test method for performance testing of certain active Noise Control (ANC) systems. It sets out requirements for the measurement set-up and representation of the results. The work carried out so far is a first step towards a test method, and this preliminary method can be used as a guideline for testing ANC systems.

In the period 1996 to 1998 DELTA and the Danish Shooting Association investigated the influence of extended firing sheds and shooting blinds on the noise level in the surroundings. The reason for this was that all Danish shooting ranges had to comply with the noise limits in Guideline 1/1995 from the Danish Environmental Protection Agency, which increased the need for reducing the noise.

In the period 1996 to 1998 DELTA and the Danish Shooting Association investigated the influence of extended firing sheds and shooting blinds on the noise level in the surroundings. The reason for this was that all Danish shooting ranges had to comply with the noise limits in Guideline 1/1995 from the Danish Environmental Protection Agency, which increased the need for reducing the noise.

Noise with prominent impulses is more annoying than continuous types of noise (without impulses or tones) with the same equivalent sound pressure level. Therefore an adjustment KI is added to the measured LAeq, if prominent impulses are present in the noise, to adjust for the extra annoyance due to the impulses.

This Nordtest Method is a guide to the content, conduct, text file output describing the survey, procedures, sites and objective measures, and the data file output of sociovibrational and social surveys measuring annoyance due to vibrations in dwellings from road and rail traffic.

This Nordtest Method specifies a method of measuring in the laboratory, the noise emission (sound power level) from a radiator valve coupled to a specified reference radiator when a flow of water is forced through the valve at specified reference operating conditions.

This Nordtest method provides quidelines for determining the A-weighted declared single-number and dual-number noise emission values of machinery and equipment based on the determination of their spectrum or A- and C-weighted noise levels.

This Nordtest method specifies operating conditions and methods to determine the sound power level and the emission sound pressure level at the work station of vibratory plate compactors. The results can be used to compare different vibratory plate compactors.

This document specifies methods for measuring the A-weighted sound pressure level in rooms. The A-weighted sound pressure level is assumed to be due to noise from sources within the building. Guidelines for the correction of measurements made under one condition to values representative of other conditions are given in ANNEX A. ANNEX A is not an integral part of this method.

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Nordtest

Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.